interop - Calling a dll created in VB6 from F# -

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i trying call dll file created in vb6 f#. have written following dll.

public function addtwonumbers(byval integer, byval b integer)     addtwonumbers = + b end function

now want call in f# program, wrote code

open system.runtime.interopservices  module interopwithnative =    [<dllimport(@"c:\add", callingconvention = callingconvention.cdecl)>]      void addtwonumbers(int, int)  interopwithnative.addtwonumbers(3,4)  let result = addtwonumbers_ 2.0 3.0

it gives me errors , doesn't recognize function.

a working interop example entrypoint

open system.runtime.interopservices // dllimport  module kernelinterop =      [<dllimport("kernel32.dll", entrypoint="beep")>]     extern void beep( int frequency, int duration )  kernelinterop.beep  // val beep : int * int -> unit kernelinterop.beep(440, 1000)

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